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Jambav. Toondoo [Web log message]. Retrieved from http://www.toondoo.com/

State Board of Education, D. O. P. I. (2003). Standard course of study [Web log message]. Retrieved from http://www.ncpublicschools.org/curriculum/mathematics/scos/2003/k-8/35grade7

Stephen. (2010, August 25). Framework for 21st century learning [Web log message]. Retrieved from http://stephenslighthouse.com/2010/08/25/framework-for-21st-century-learning/